Improvement in balance-valves for steam-pumps



UNITED STETEs PATENT @EEIGE JAMES V. PANGBURN, OF GALESBURG, ILLINOIS, ASSIGNOE TO HIMSELF AND JAMES T. CLARK, OF SAME PLAGE.

IMPROVEMENT IN ALANCE-VALVES FOR STEAM-PUMPS.

Specification forming part of Letters Patent No. 117,808, dated August 8, 1871.

To all whom 'it may concern:

Be it known that I, JAMES V. PANGBURN, of Galesburg, in the county of Knox and State or' Illinois, have invented certain Improvements in Adjustable Balance-Valves for Steam-Pumps, of which the following is a specication:

The nature of my invention relates to improvements in slide-valves in the steam-chests of ordinary steam-pumps and the invention consists in the construction and arrangement of a hollow cylimilrical valve with the ordinary fiat valve7 and in so connecting the two that they may be readily adjusted to compensate for wear,

all as hereinafter fully described.

Figure l is a side elevation oi' a machine embodying my invention, partly in perspective and partly in section, and with parts broken away. Fig. 2 is a vertical longitudinal sectional view of the cylindrical valve G of Fig. l.

A represents the pump-cylinder, constructed in the usual manner, and provided with an air-dome, B. C is the piston-cylinder; D, the piston, with a piston-rod, E, extending from the piston D to the pump-cylinder A. F is a trough connecting the pistoircylinder D and the pump-cylinder A. G is a cylindrical valve, constructed as hereinafter described. H is a valve-stem'screwed into one cud of the valve G and extending outward through the valve-chamber I, and carrying collars h h, as shown in the drawing. I is the valve-chamber, in which the cylindrical valve G iits accurately transversely, and in which it can have a reciprocating motion. J is an arm, attached at its lower end to the piston-rod E, and having an eye at its upper end through which that part of the valve-stein H between the collars h h passes in the usual manner. K is the steam-chest. L is the slide-valve, constructed in the usual manner. M M are bolts, threaded at each end, with a left-hand screw on one end and a right-hand one on the other, and having their central parts square, as shown, for the reception of a wrench to operate them. The upper ends of the bolts M are screwed into the lower side of the valve G, as shown by parts broken away, and the lower ends are screwed into the upper side of the slidevalve L. N N are the steam-ports, leading from the steam-chest K to the steam-cylinderG These ports N f N are crossed, as plainly shown in the drawing, the one from the right-hand end of the steam chest leading to the left hand end of steam-cylinder a-nd the one from the left-hand end of the steam-chest leading to the right-hand end of the steam-cylinder. The construction of the valve G is shown at Fig. 2, being hollow its entire length, except a head at one end into which the valve-stem H is screwed, as shown plainly at the same ligure. g g g are small openings leading from the interior of the cylinder G out through the head thereof.

rlhe operation of my invention is as follows: The parts of the machine being in the position shown at Fig. l, and steam entering at the induction-port P will pass through the open port N to the left-hand end of the cylinder C, driving the piston D to the other end, and, through the means of piston-rod E, arm J, valve-stein H, cylindrical valve G, and rods M M, carrying the valve L to the right-hand side of steam-chest K, thereby closing the port N and opening the port N through which steam enters to the ri ght-hand end of the cylinder O, driving it back again to the left, the steam in the left-hand end escaping through the port N to the hollow under side of the valve L, and from thence to the air through the eduction-port S. The pressure ofthe steam on the under side ofthe valve G will fully counterbalance the pressure on the upper side of the valve L, and, should any steam pass along by any means to the ends of the valve-chamber I, the hollow valve G will allow it to pass through freely and prevent its forming a cushion in the ends to prevent the free action of the said valve G. Should the valve L become worn it may be readjusted to its seat by the screw-bolts M M, and the pressure of the valve L on its seat may be regulated at any time by the same means.

I claim- The rods M' M and valves G and L, constructedv substantially as described, and arranged to operate in combination with the ports N N substantially as and for the purpose specified.

f JAMES V. PANGBURN.

Witnesses PLATT R. RICHARDS, J. J. TUNNIGLIFF. 

